Padalecki 1

Question 1

A. The shape of the orbit is almost ______.

1. Medial walls are _____; lateral walls are ______.
2. Comprised of all or part of _____ bones
3. Lined with _____ (orbital periosteum) which forms a funnel shaped fascial sheath that encloses the orbital contents.

Answer 1

A. pyramidal

1. parallel; at right angles
2. seven
3. periorbita

Question 2

Boundaries of the Orbital margin

Answer 2

a. Frontal bone
b. Maxilla
c. Zygomatic bone

Question 3

Boundaries of the Superior wall or roof

Answer 3

a. Frontal bone (orbital plate)

b. Lesser wing of the sphenoid bone (posterior part)

Question 4

Boundaries of the Medial wall

Answer 4

a. Ethmoid - lamina papyracea
b. Frontal bone
c. Lacrimal bone
d. Sphenoid bone

Question 5

Boundaries of the Inferior wall

Answer 5

(Separated from lateral wall by the inferior orbital fissure)

a. Maxilla - orbital surface
b. Zygomatic bone
c. Palatine bone – (orbital process)

Question 6

Boundaries of the Lateral wall

Answer 6

a. Zygomatic bone - frontal process

b. Sphenoid bone - greater wing

Question 7

1. Orbital margin—fractures at _____.
2. Blowout fractures: ____ and ____ walls are thin and may fracture while the margin remains intact
3. _____ wall is stronger but still thin and can be penetrated by sharp objects. Problematic because it is directly related to the frontal lobe.

Answer 7

1. sutures
2. medial and inferior
3. Superior

Question 8

Vessels in optic canal

Answer 8

• transmits optic nerve (CN II)

- ophthalmic artery

Question 9

Vessels in Superior Orbital Fissure

Answer 9

• oculomotor nerve (CN III)
• trochlear nerve (CN IV)
• ophthalmic division of trigeminal nerve (CN V1)
• abducens nerve (CN VI)
• superior ophthalmic vein

Question 10

Vessels in Inferior Orbital Fissure

Answer 10

• Maxillary division of the trigeminal nerve (CN V2)
• infraorbital artery
• infraorbital vein

Question 11

Soft tissues of the orbit

Answer 11

A. Skin
B. Tela subcutanea
C. Orbicularis oculi muscle
D. Fibrous layer
E. Conjunctiva

Question 12

Components of fibrous layer

Answer 12

1. Orbital septum
2. Aponeurosis of levator palpebrae superioris muscle
3. Superior tarsal muscle
4. Tarsal plate

Question 13

Components of the conjunctiva

Answer 13

1. Palpebral conjuntiva
2. Orbital conjunctiva
3. Conjunctival fornix

Question 14

Muscles responsible for opening palpebral fissure

Answer 14

1. Levator palpebrae superioris

2. Superior tarsal muscle

Question 15

Muscles responsible for closing palpebral fissure

Answer 15

1. Orbicularis oculi

Question 16

Components of lacrimal apparatus

Answer 16

1. Lacrimal gland
2. Lacrimal puncta
3. Lacriaml canaliculi
4. Lacrimal sac
5. Nasolacrimal duct

Question 17

Innervation of superior oblique m.

Answer 17

CN IV (trochlear)

Question 18

Innervation of lateral rectus m.

Answer 18

CN VI (abducens)

Question 19

Innervation of Levator palpebrae superioris, Inferior rectus, Medial rectus, Superior rectus, Inferior oblique

Answer 19

CN III (oculomotor)

Question 20

Action of medial rectus

Answer 20

Adduction

Question 21

Action of lateral rectus

Answer 21

Abduction

Question 22

Action of superior rectus

Answer 22

1. Elevation

2. Adduction

Question 23

Action of inferior rectus

Answer 23

1. Depression

2. Adduction

Question 24

Action of inferior oblique

Answer 24

1. Elevation

2. Abduction

Question 25

Action of superior oblique

Answer 25

1. Depression | 2. Abduction

Question 26

Branches of ophthalmic artery (branch of internal carotid, enters orbit through optic canal)

Answer 26

1. Posterior ethmoidal 2. Anterior ethmoidal 3. Dorsal nasal 4. Supratrochlear 5. Supraorbital 6. Central artery of the retina 7. Ciliary arteries (long and short posterior) 8. Lacrimal 9. Palpebral arteries

Question 27

Veins of the orbit

Answer 27

1. Supraorbital vein 2. Infraorbital vein 3. Superior ophthalmic vein 4. Inferior ophthalmic vein

Question 28

Nerves of the orbit

Answer 28

1. Optic (CN II) 2. Oculomotor (CN III) 3. Trochlear (CN IV) 4. Ophthalmic (CN V1) 5. Abducens (CN VI)

Question 29

Branches of ophthalmic nerve

Answer 29

1. Frontal nerve 2. Nasociliary nerve 3. Anterior ethmoid 4. Infratrochlear 5. Long ciliary 6. Short ciliary

Question 30

Layers of eyeball

Answer 30

1. Fibrous coat 2. Vascular coat 3. Retina

Question 31

Components of fibrous coat

Answer 31

1. Sclera | 2. Cornea

Question 32

Components of vascular coat

Answer 32

1. Choroid 2. Ciliary body 3. Iris

Question 33

Components of retina

Answer 33

1. Optic part | 2. Non-visual part

Question 34

Refractive media

Answer 34

1. Cornea 2. Aqueous humor 3. Lens

Question 35

Smooth muscle of eyeball

Answer 35

1. Ciliary muscle 2. Sphincter pupillae muscle 3. Dilator pupillae muscle 4. Superior tarsal muscle